Dec 21, 2014
The key documentation links are located on the space Home page, such as SystemRequirements, Installation, and UpgradingFromV2 material.
This release should interoperate with all previous releases of Shibboleth and other software that supports the same standards. As a major upgrade, the list of issues fixed and features added is numerous.
To monitor bug reports against this release should you encounter problems, you can check here (IdP) and here (OpenSAML).